Here, the narrator is a bit of a liar. Like, a LOT of a liar. Like, "I'm-a-lying-on-a-very-regular-basis" kind of liar.
He's always spinning tales of wild adventures, but they never quite add up. Like, "I once met a talking chicken, I swear!" or "I discovered a hidden treasure on the moon!"
But don't worry, it's not like he's trying to deceive you or anything. Nope, not at all. He's totally telling the truth. (Just ask him, he'll tell you the truth. Probably.)